Let-off mechanism for looms.



PATENTED FEB. 7, 1905.

C. P. ROPER.

LET-OPP MECHANISM FOR LOOMS.

APPLICATION mum 00126, 1904.

Patented February 7, 1905.

UUKNITED STATES PATENT @FFICE.

CHARLES F. ROPER, OF HOPEDALE. HASSAOHUSETTS, ASSIH-NOR TO DRAPEH COMPANY, OF IIOPEDAL l, MASSAUUUSE'ITS, A CORPORA- TlON OF MAINE.

LET-OFF MECHANISM FOR LOONIS.

SPECIFICATION forming part of Letters Patent No. 781,681, dated February '7, 1905,

Application filed October 26, 1904. Serial No. 230,011.

To (/J/ 1r/umt it 7lI/(L l/ concern.-

Be it known that I. CHARLns F. Borne, a citizen of the United States, and a resident of Hfopedale, county of \Vorcester, State of Massachusetts, have invented an Improvement in Let-Off Mechanism for Looms, of which the following description, in connection with the accompanying drawings, is a specification, like characters on the drawings representing like parts.

This invention relates to let-off mechanism for looms; and it has for its object the production of novel and simple means for arresting the operation of the let-off mechanism when an abnormal condition arises in the running of the loom, such as banging off.

In United States Patent No. 710,02, dated September 30, 1902, means are shown for rendering inoperative the actuating-pawl of the let-off mechanism, comprising, a controller which is moved into engagement with the tail and lifts the point of the pawl from the ratchet, and a detent then holds the controller in such engagement for a predetermined time. A tappct mounted on a rotating member of the loom acts upon the detent at the proper time and releases the controller, the latter in turn permitting the let-off pawl to resume its operation. In my present invention .1 have provided very simple means for rendering inoperative and maintaining the pawl inoperative and for releasing the pawl after takeup has been arrested for a predetermined length of time.

My invention is illustrated in connection with a loom provided with means to positively cause an abnormal slackening of the warp when the loom bangs off, as in United States Patent No. 731,662.

Figure 1 illustrates in side elevation a loom embodying one form of my invention, the parts being shown in normal position; and Fig. 2 is a detail showing the let-off pawl held in inoperative position.

The warp-beam B, its actuatingmechanism, including a ratchet B, a cooperating let-off pawl 1/, compound pawl-carrier (I, link (1", connected with the laysword A the whip-roll lV, mounted on arms 11/, fulcrumed on the shaft m, the controlling rock-shaft N, the cooperating locking-arms m if connecting the shafts, and the depending arm \V, pivotally connected .by a rod 11 with the member c of the pawl-carrier and having a collar 11 fast upon it, the spring S, coiled around the rod between the collar 11. and an ear 6 on the loom side, are and may beall as in said Patent No. 731,662 and operate as therein set forth. So, too, the shipper L, knock-off lover a c, frog 0, slidably mounted on the loom side, the dagger (1", and binder-linger (5, fast on the protector rock-shaft (1', and the link )1 pivotally connected at one end with the frog and at its other end with the upturned arm )1, fast on the shaft N, are and may be as in said patent, the forward movement of the frog by the operation of the protector mechanism moving the link 12 forward and turning the rock-shaft N in the direction of arrow 25, Fig. 1, unlocking the whip-roll and slackening the warps, so that as the lay beats up the shuttle cannot tear or strain the warps.

A short arm 1, fast on the rock-shaft N, is connected by a light red or link 2 with a spring x attached to the actuating or let-off pawl (P between the toe and the fulcrum thereof to lift the pawl from engagement with the ratchet B" when the loom bangs off and the rock-shaft N is turned, as described. 1 have herein shown the tail 3 of the pawl extended to cooperate with a device which acts as a spring to normally maintain the pawl in engagement with the ratchet and abnormally to serve as a detent for and to maintain the pawl inoperative until released. This device is shown as a spring plate or linger &, secured to the member (Z of the pawl-carrier and having its flat free end 5 adapted to normally lift the tail of the pawl, as in Fig. 1, the linger having a bend or shoulder 6 below the part 5 to engage the tail at times and hold the pawl inoperative, as in Fig. 2. At the opposite or rear edge of the pawl-can rier a pawl-releasing device is provided, shown as a plate 7, adjustably secured to the loom side by a clamping-bolt 8 and having a cam lip or rib 9, which is in close proximity to the toe of the pawl on each operating stroke of the pawl-carrier. (See Fig. 1.) hen the loom bangs off, the turning of the rock-shaft N lifts the rod 2 and stretches the spring 8 disengaging the pawl from the ratchet, the toe of the pawl engaging the cam-lip 9 before the tail 3 is depressed far enough to be engaged by the detent 6. As soon, however, as the lay swings back far enough to permit movement of the pawl-carrier forward, or to the left, Fig. 1, the pawl will be freed from the cam-lip, and the spring 8 will contract enough to cause the tail 3 to engage the detent 6, as shown in Fig. 2, the pawl thus being maintained inoperative, and let-ofl is arrested. On the next stroke of the pawl-carrier to the right, viewing Fig. l, the toe of the pawl engages the cam 9 and is thereby pushed down, the tail 3 being lifted and disengaged from the detent 6, so that the flat part 5 of the spring-finger acts to throw the pawl again into cooperation with the ratchet, but at the end of the stroke, thus terminating the period during which letofi is arrested, and inasmuch as the let-off mechanism is thereby restored to operative condition let-0E is resumed. The releasingcam 9 is made adjustable, so that the disengagement of the pawl and detent can be accurately set and determined.

The construction is simple, direct, and positive in operation and eflicient, let-off being arrested during the period the warp is slackened.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a loom, let-off mechanism, including an actuating-pawl, a movable pawl-carrier, a detent mounted thereon, means to render the pawl inoperative and place it under the control of the detent when the loom bangs off, to thereby arrest let-off, and a'device to eflect release of the pawl from the detent after a predetermined interval.

2. In a loom, let-off mechanism, including an actuating-pawl, a detent, means to render the pawl inoperative and place it under the control of the detent when the loom bangs off, to thereby arrest let-off, and a separate device to engage the pawl after a predetermined interval and remove it from the control of the detent. I

3. In a loom, let-off mechanism, including a ratchet and an actuating-pawl to cooperate therewith, a spring to maintain the pawl in operative or in inoperative position, means to positively move the pawl into inoperative position when the 100m bangs off, and separate means to thereafter positively move the pawl into operative position, the spring maintaining the pawl inoperative until the operation of said last-mentioned means;

4. In a loom, let-off mechanism, including a pawl, a vibrating pawl-carrier, a detent mounted thereon, means to move the pawl relatively to the pawl-carrier into inoperative position and place it under the control of the detent when the loom bangs off, and a fixed releasing device to thereafter engage the pawl and effect its release from the detent by or through subsequent movement of the pawlcarrier.

5. In let-ofl mechanism for looms, an actuating-pawl, a movable pawl-carrier, a detent, a means acting independently of the pawl-carrier to render the pawl inoperative and place it under the control of the detent when the loom bangs otl, and separate means to thereafter efi'ect release of the pawl by or through subsequent movement of the pawl-carrier.

' In testimony whereof I have signed my name to this specification in the presence of two sub- \Vitnesses:

GEORGE OTIS DRAPER, ERNEST W. Wool). 

